It looks to me like Slan's wound is more responsible for Gut's current "unconscious" fighting state than the armor itself (although it's difficult to tell without translations). The armor is definitely exacerbating the wound (feeding off his "spirit" maybe?).
Re:Chapter 225
"And, in the place wherethis armor is not black, end of "black guts" was felt."
The speculation regarding the color of Gut's new "skull armor" came directly from our friend at the babbling fish.
So take it for what you will.
Re:Chapter 225
Few things of note from our friend the babelfish guy.
The title of the chapter is 'Mania (maniac?) Soldier'.
He also claims (in big bold letters) that Gut's new skull armor is not black. (wtf color is it then?)
Our ace at Nifty.com is generally punctual with his summaries. I take the lack of a gibberish babel fish translation by this late in the week as an ominous sign.